Abstract High water pressure is one of the primary reasons for fracture water inrush through numerous cracks at the entry points of deep tunnels. Two types of tensile shear failure modes and one type of compression shear failure mode have been established for fracture water inrush under high water pressure condition. In this study, the condition for critical water pressure for two-dimensional crack initiation is proposed and the criterion for water inrush in fractured rock mass is revealed. Next, the model of crack cementation weakening and block collapse under continuous action of water pressure is established. Finally, the collapsing process of the block under the action of hydraulic pressure is simulated by immersed body–spectral element method (IB–SEM) system.

中文翻译：

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水压作用下裂缝突水及块体坍塌机理

摘要 高水压是深部隧道入口处大量裂缝发生裂缝突水的主要原因之一。针对高水压条件下的裂缝突水，建立了两种拉伸剪切破坏模式和一种压缩剪切破坏模式。本研究提出二维裂纹萌生临界水压条件，揭示裂隙岩体突水判据。其次，建立了水压连续作用下裂缝胶结减弱和块体坍塌的模型。最后，通过浸入体-光谱元法（IB-SEM）系统模拟了液压作用下块体的坍塌过程。